sqf: Fix sqfc byte offset (#771)

* sqf: Fix sqfc byte offset

* for clippy

libs/sqf/src/compiler/mod.rs

@@ -74,10 +74,7 @@ impl Statements {
                 ctx.add_constant(Constant::String(self.source.clone()))?,
             ))
         } else {
-            let start = processed
-                .mapping(self.span.start)
-                .expect("first statement not in mapping");
-            let offset = start.processed_start().offset() as u32;
+            let offset = processed.get_byte_offset(self.span.start);
             let source = processed.extract(self.span.clone());
             let length = if self.content.is_empty() {
                 0
@@ -102,8 +99,9 @@ pub fn location_to_source(processed: &Processed, location: &Range<usize>) -> Sou
     let map = processed.mapping(location.start).expect(
         "location not in mapping, this should not happen as the location is from the processed file",
     ).original();
+    let offset = processed.get_byte_offset(location.start);
     SourceInfo {
-        offset: location.start as u32,
+        offset,
         file_index: processed
             .sources()
             .iter()

libs/workspace/src/reporting/processed.rs

@@ -258,6 +258,14 @@ impl Processed {
         self.mappings(offset).last().copied()
     }
 
+    #[must_use]
+    #[allow(clippy::cast_possible_truncation)]
+    /// Get offset as number of raw bytes into the output string
+    pub fn get_byte_offset(&self, offset: usize) -> u32 {
+        let ret: usize = self.output.chars().take(offset).map(char::len_utf8).sum();
+        ret as u32
+    }
+
     #[must_use]
     /// Returns the warnings
     pub fn warnings(&self) -> &[Arc<dyn Code>] {